FantomX.tween = {
                easeInQuad: function(pos){
                    return Math.pow(pos, 2);
                },

                easeOutQuad: function(pos){
                    return -(Math.pow((pos-1), 2) -1);
                },

                easeInOutQuad: function(pos){
                    if ((pos/=0.5) < 1) return 0.5*Math.pow(pos,2);
                    return -0.5 * ((pos-=2)*pos - 2);
                },

                easeInCubic: function(pos){
                    return Math.pow(pos, 3);
                },

                easeOutCubic: function(pos){
                    return (Math.pow((pos-1), 3) +1);
                },

                easeInOutCubic: function(pos){
                    if ((pos/=0.5) < 1) return 0.5*Math.pow(pos,3);
                    return 0.5 * (Math.pow((pos-2),3) + 2);
                },

                easeInQuart: function(pos){
                    return Math.pow(pos, 4);
                },

                easeOutQuart: function(pos){
                    return -(Math.pow((pos-1), 4) -1)
                },

                easeInOutQuart: function(pos){
                    if ((pos/=0.5) < 1) return 0.5*Math.pow(pos,4);
                    return -0.5 * ((pos-=2)*Math.pow(pos,3) - 2);
                },

                easeInQuint: function(pos){
                    return Math.pow(pos, 5);
                },

                easeOutQuint: function(pos){
                    return (Math.pow((pos-1), 5) +1);
                },

                easeInOutQuint: function(pos){
                    if ((pos/=0.5) < 1) return 0.5*Math.pow(pos,5);
                    return 0.5 * (Math.pow((pos-2),5) + 2);
                },

                easeInSine: function(pos){
                    return -Math.cos(pos * (Math.PI/2)) + 1;
                },

                easeOutSine: function(pos){
                    return Math.sin(pos * (Math.PI/2));
                },

                easeInOutSine: function(pos){
                    return (-.5 * (Math.cos(Math.PI*pos) -1));
                },

                easeInExpo: function(pos){
                    return (pos==0) ? 0 : Math.pow(2, 10 * (pos - 1));
                },

                easeOutExpo: function(pos){
                    return (pos==1) ? 1 : -Math.pow(2, -10 * pos) + 1;
                },

                easeInOutExpo: function(pos){
                    if(pos==0) return 0;
                    if(pos==1) return 1;
                    if((pos/=0.5) < 1) return 0.5 * Math.pow(2,10 * (pos-1));
                    return 0.5 * (-Math.pow(2, -10 * --pos) + 2);
                },

                easeInCirc: function(pos){
                    return -(Math.sqrt(1 - (pos*pos)) - 1);
                },

                easeOutCirc: function(pos){
                    return Math.sqrt(1 - Math.pow((pos-1), 2))
                },

                easeInOutCirc: function(pos){
                    if((pos/=0.5) < 1) return -0.5 * (Math.sqrt(1 - pos*pos) - 1);
                    return 0.5 * (Math.sqrt(1 - (pos-=2)*pos) + 1);
                },

                easeOutBounce: function(pos){
                    if ((pos) < (1/2.75)) {
                        return (7.5625*pos*pos);
                    } else if (pos < (2/2.75)) {
                        return (7.5625*(pos-=(1.5/2.75))*pos + .75);
                    } else if (pos < (2.5/2.75)) {
                        return (7.5625*(pos-=(2.25/2.75))*pos + .9375);
                    } else {
                        return (7.5625*(pos-=(2.625/2.75))*pos + .984375);
                    }
                },

                easeInBack: function(pos){
                    var s = 1.70158;
                    return (pos)*pos*((s+1)*pos - s);
                },

                easeOutBack: function(pos){
                    var s = 1.70158;
                    return (pos=pos-1)*pos*((s+1)*pos + s) + 1;
                },

                easeInOutBack: function(pos){
                    var s = 1.70158;
                    if((pos/=0.5) < 1) return 0.5*(pos*pos*(((s*=(1.525))+1)*pos -s));
                    return 0.5*((pos-=2)*pos*(((s*=(1.525))+1)*pos +s) +2);
                },

                elastic: function(pos) {
                    return -1 * Math.pow(4,-8*pos) * Math.sin((pos*6-1)*(2*Math.PI)/2) + 1;
                },

                swingFromTo: function(pos) {
                    var s = 1.70158;
                    return ((pos/=0.5) < 1) ? 0.5*(pos*pos*(((s*=(1.525))+1)*pos - s)) :
                        0.5*((pos-=2)*pos*(((s*=(1.525))+1)*pos + s) + 2);
                },

                swingFrom: function(pos) {
                    var s = 1.70158;
                    return pos*pos*((s+1)*pos - s);
                },

                swingTo: function(pos) {
                    var s = 1.70158;
                    return (pos-=1)*pos*((s+1)*pos + s) + 1;
                },

                bounce: function(pos) {
                    if (pos < (1/2.75)) {
                        return (7.5625*pos*pos);
                    } else if (pos < (2/2.75)) {
                        return (7.5625*(pos-=(1.5/2.75))*pos + .75);
                    } else if (pos < (2.5/2.75)) {
                        return (7.5625*(pos-=(2.25/2.75))*pos + .9375);
                    } else {
                        return (7.5625*(pos-=(2.625/2.75))*pos + .984375);
                    }
                },

                bouncePast: function(pos) {
                    if (pos < (1/2.75)) {
                        return (7.5625*pos*pos);
                    } else if (pos < (2/2.75)) {
                        return 2 - (7.5625*(pos-=(1.5/2.75))*pos + .75);
                    } else if (pos < (2.5/2.75)) {
                        return 2 - (7.5625*(pos-=(2.25/2.75))*pos + .9375);
                    } else {
                        return 2 - (7.5625*(pos-=(2.625/2.75))*pos + .984375);
                    }
                },

                easeFromTo: function(pos) {
                    if ((pos/=0.5) < 1) return 0.5*Math.pow(pos,4);
                    return -0.5 * ((pos-=2)*Math.pow(pos,3) - 2);
                },

                easeFrom: function(pos) {
                    return Math.pow(pos,4);
                },

                easeTo: function(pos) {
                    return Math.pow(pos,0.25);
                },

                linear:  function(pos) {
                    return pos
                },

                sinusoidal: function(pos) {
                    return (-Math.cos(pos*Math.PI)/2) + 0.5;
                },

                reverse: function(pos) {
                    return 1 - pos;
                },

                mirror: function(pos, transition) {
                    transition = transition || FantomX.tween.sinusoidal;
                    if(pos<0.5)
                        return transition(pos*2);
                    else
                        return transition(1-(pos-0.5)*2);
                },

                flicker: function(pos) {
                    var pos = pos + (Math.random()-0.5)/5;
                    return FantomX.tween.sinusoidal(pos < 0 ? 0 : pos > 1 ? 1 : pos);
                },

                wobble: function(pos) {
                    return (-Math.cos(pos*Math.PI*(9*pos))/2) + 0.5;
                },

                pulse: function(pos, pulses) {
                    return (-Math.cos((pos*((pulses||5)-.5)*2)*Math.PI)/2) + .5;
                },

                blink: function(pos, blinks) {
                    return Math.round(pos*(blinks||5)) % 2;
                },

                spring: function(pos) {
                    return 1 - (Math.cos(pos * 4.5 * Math.PI) * Math.exp(-pos * 6));
                },

                none: function(pos){
                    return 0
                },

                full: function(pos){
                    return 1
                }
            }
